Plastic bag identification for "toxic plastic bags", the public need not panic, as long as we know some basic knowledge of plastic packaging materials and master some effective identification methods, then we can do how to use plastic bags safely and reasonably.

目前市场上常见的有毒塑料袋一般指的是单膜包装袋。这类包装袋的材料中，聚氯乙烯是有毒的（改性聚氯乙烯除外）。所谓“有毒”，是指塑料袋材料本身含有对人体有害的物质，如某些重金属及其盐类以及聚合物的单体，其中尤以重金属铅和氯乙烯单体对人体为有害（乙烯、丙烯单体是的）。区分包装材料是否有毒，主要在于将有毒的聚氯乙烯材料区分开来或将加入了有毒再生料的聚乙烯材料区分开。

At present, the common toxic plastic bags on the market generally refer to single film packaging bags. In this kind of packing bag material, PVC is toxic (except modified PVC). The so-called "toxic" refers to that the plastic bag material itself contains substances harmful to human body, such as some heavy metals, salts and monomer of polymers, especially heavy metals, lead and vinyl chloride monomer are harmful to human body (ethylene and propylene monomer are non-toxic). To distinguish whether the packaging materials are toxic or not, it is mainly to distinguish the toxic PVC materials or the polyethylene materials with toxic recycled materials.

“闻”：指充分发挥人的嗅觉功能。如果我们闻到塑料包装袋有明显的臭味或异味，那么就得当心其有毒，千万不可用于装食品，因为食品级塑料包装袋是无味、无臭的。

"Smell": refers to the full distribution of the olfactory function of the volatilizer. If we smell the obvious odor or peculiar smell of plastic packaging bags, then we should be careful that they are poisonous and should not be used to pack food, because food grade plastic packaging bags are tasteless and odorless.

“看”：指看颜色和均匀度。未加色料的“超薄型”和“薄型”塑料袋应呈微浮白色且透明，对光观察，其材料应均匀，无黑点或脏点（块）；有色“薄型”和“普通型”塑料袋，尤其是深色的（如黑色）因其难以用眼光鉴别，不易用来装食品。

"Look": refers to look at the color and uniformity. The "ultra thin" and "thin" plastic bags without color additive shall be slightly floating white and transparent, and the materials shall be uniform without black spots or dirty spots (blocks) when observed with light; the colored "thin" and "ordinary" plastic bags, especially the dark ones (such as black) are difficult to be identified with eyes, so they are not easy to be used for food.

烧：指从塑料袋上取一小块，用火点燃，观察火焰颜色，并闻其气味，聚乙烯材料燃烧火焰应该是上端黄、下端蓝，且燃烧时滴落，能闻到石腊气味；而聚氯乙烯材料的燃烧火焰应是上端黄、下端绿，冒白烟，有刺激性难闻气味。

Burning: take a small piece from the plastic bag, light it with fire, observe the color of the flame and smell it. The flame of polyethylene material should be yellow at the upper end and blue at the lower end, and it drips when burning, and it can smell the smell of paraffin; while the flame of PVC material should be yellow at the upper end and green at the lower end, emitting white smoke, with pungent and unpleasant smell.

测：指测材料的比重。从塑料袋上取一小块，加热让其卷缩再放入水中，如浮于水面，则是聚乙烯材料，若沉于水底，则可能是聚氯乙烯材料或其它非食品级材料。

Measurement: refers to the specific gravity of materials. Take a small piece from the plastic bag, heat it to shrink and put it into the water. If it floats on the water surface, it is polyethylene material. If it sinks on the water bottom, it may be PVC material or other non food grade material.

以上四种方法中“闻”、“烧”、“测”是用于鉴别聚乙烯材料和有毒聚氯乙烯材料；“看”、“烧”用于识别聚乙烯材料中是否加入了再生料（有毒或的）。

Among the above four methods, "smell", "burn" and "test" are used to identify non-toxic polyethylene materials and toxic PVC materials; "look" and "burn" are used to identify whether recycled materials (toxic or non-toxic) are added to non-toxic polyethylene materials.

另外，在此提醒广大市民，不论什么情况，在食品购回家后，应尽快将食品从塑料袋中取出，以保万无一失。即使因未鉴别出而使用了有毒的塑料袋，如果回家后能及时从袋中取出，短暂的时间，不会对食品造成很大的危害，因为毒素的转移既需要与食品充分接触，也需要时间。同时，在此呼吁各大、在定购单膜包装袋时，应选择正规塑料制品厂家，以保市民的健康。

In addition, the general public is reminded that, in any case, after the food is bought home, the food should be taken out of the plastic bag as soon as possible to ensure that there is no loss. Even if a toxic plastic bag is used because it is not identified, if it can be taken out of the bag in time after going home, it will not cause great harm to the food for a short time, because the transfer of the toxin requires both full contact with the food and time. At the same time, we call on shopping malls and supermarkets to choose regular plastic products manufacturers when ordering single film packaging bags, so as to protect the health of the public.